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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28648
Title: The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: Evolution of the Molecular Gas in CO-selected Galaxies
Authors: Aravena, Manuel
DECARLI, ROBERTO 
Gónzalez-López, Jorge
Boogaard, Leindert
Walter, Fabian
Carilli, Chris
Popping, Gergö
Weiss, Axel
Assef, Roberto J.
Bacon, Roland
Bauer, Franz Erik
Bertoldi, Frank
Bouwens, Richard
Contini, Thierry
Cortes, Paulo C.
Cox, Pierre
da Cunha, Elisabete
Daddi, Emanuele
Díaz-Santos, Tanio
Elbaz, David
Hodge, Jacqueline
Inami, Hanae
Ivison, Rob
Le Fèvre, Olivier
Magnelli, Benjamin
Oesch, Pascal
Riechers, Dominik
Smail, Ian
Somerville, Rachel S.
Swinbank, A. M.
Uzgil, Bade
van der Werf, Paul
Wagg, Jeff
Wisotzki, Lutz
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 882
Issue: 2
First Page: 136
Abstract: We analyze the interstellar medium properties of a sample of 16 bright CO line emitting galaxies identified in the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Large Program. This CO-selected galaxy sample is complemented by two additional CO line emitters in the UDF that are identified based on their Multi-Unit Spectroscopic Explorer (MUSE) optical spectroscopic redshifts. The ASPECS CO-selected galaxies cover a larger range of star formation rates (SFRs) and stellar masses compared to literature CO emitting galaxies at z > 1 for which scaling relations have been established previously. Most of ASPECS CO-selected galaxies follow these established relations in terms of gas depletion timescales and gas fractions as a function of redshift, as well as the SFR-stellar mass relation (“galaxy main sequence”). However, we find that ∼30% of the galaxies (5 out of 16) are offset from the galaxy main sequence at their respective redshift, with ∼12% (2 out of 16) falling below this relationship. Some CO-rich galaxies exhibit low SFRs, and yet show substantial molecular gas reservoirs, yielding long gas depletion timescales. Capitalizing on the well-defined cosmic volume probed by our observations, we measure the contribution of galaxies above, below, and on the galaxy main sequence to the total cosmic molecular gas density at different lookback times. We conclude that main-sequence galaxies are the largest contributors to the molecular gas density at any redshift probed by our observations (z ∼ 1-3). The respective contribution by starburst galaxies above the main sequence decreases from z ∼ 2.5 to z ∼ 1, whereas we find tentative evidence for an increased contribution to the cosmic molecular gas density from the passive galaxies below the main sequence.
URI: http://hdl.handle.net/20.500.12386/28648
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab30df
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab30df
Bibcode ADS: 2019ApJ...882..136A
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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